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A spokesman said: "Increasingly frequent snow showers already affecting parts of Scotland, Northern Ireland and northern England will extend across many other northern and western parts of the UK.

"2-5 cm of snow is likely fairly widely, with 10-20 cm in places, mainly northern Scotland, Northern Ireland, north Wales and the Midlands. Icy surfaces are also likely to be an additional hazard, especially overnight.

"There will be possible travel delays on roads stranding some vehicles and passengers in some places."